Finding the Fourth Proportional to 2,276.65, 3,142.05 and 1,392.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,276.65 : 3,142.05 = 1,392.57 : x
2. Step 2: Convert to fraction form
   2,276.65/3,142.05 = 1,392.57/x
3. Step 3: Cross multiply
   2,276.65x = 3,142.05 × 1,392.57
4. Step 4: Simplify right side
   2,276.65x = 4,375,517.61
5. Step 5: Solve for x
   x = 4,375,517.61/2,276.65
6. Step 6: Final answer
   x = 1,921.91